Overhead working truck transmission system based on multi-mode driving

Abstract

The utility model belongs to the technical field of overhead working trucks, and discloses an overhead working truck transmission system based on multi-mode driving. The utility model discloses an overhead working truck transmission system based on multi-mode driving. The overhead working truck transmission system comprises a variable pump, a motor, a metering pump, a fuel engine, an oil tank, a hydraulic driving device and an energy accumulator. According to the overhead working truck transmission system based on multi-mode driving, the dual-mode power source switching process is flexible and smooth, and hydraulic impact cannot be generated on the hydraulic transmission system; a dual-mode power source is adopted, the oil consumption of the system is reduced by about 30%, the pure electric mode efficiency is improved by about 40%, and the overall energy consumption under typical working conditions (such as leveling and amplitude variation) is reduced by about 35%; in addition, the system carries out dual-mode power source switching according to the load change and / or the battery state of the working platform, so that the power source mode is matched with the working condition in real time.

Description

Technical Field

[0001] This utility model relates to the field of aerial work platform technology, specifically to an aerial work platform transmission system based on multimodal drive. Background Technology

[0002] Aerial work platforms are specialized vehicles used to transport workers and equipment for aerial operations. A typical aerial work platform includes a chassis, a turntable, a boom, and a work platform. The turntable is mounted on the chassis, the rear end of the boom is connected to the turntable, and the front end of the boom is connected to the work platform. The turntable rotates relative to the chassis, and after the boom is deployed and raised, it moves the work platform to the designated aerial work area.

[0003] Currently, aerial work platforms typically use hydraulic motors, hydraulic cylinders, and other hydraulic drive devices to move the turntable, boom, and other hydraulic drive components. Correspondingly, a hydraulic transmission system is needed to supply hydraulic oil to these drive devices to achieve hydraulic transmission. Hydraulic transmission systems generally use a fuel engine as the power source, with the engine driving an oil pump that delivers hydraulic oil from the tank to the hydraulic drive devices via hydraulic lines. However, using a fuel engine as the power source results in high fuel consumption and continuous fuel emissions that pollute the environment. With the intelligent upgrade of aerial work platforms, power batteries are often installed on the chassis to meet the power supply needs of intelligent devices. Integrating these power batteries into the hydraulic transmission system could potentially reduce fuel consumption and lower operating costs. Utility Model Content

[0004] The purpose of this invention is to propose a transmission system for aerial work platforms based on multimodal drive, which enables flexible and smooth switching between the dual-mode power sources of the hydraulic transmission system and optimizes energy consumption.

[0005] To achieve the above objectives, this utility model adopts the following technical solution:

[0006] A transmission system for an aerial work platform vehicle based on multimodal drive includes a variable pump, an electric motor, a fixed displacement pump, a fuel engine, a fuel tank, a hydraulic drive unit, and an accumulator.

[0007] The variable pump is driven by an electric motor, and the fixed displacement pump is driven by a fuel engine;

[0008] The inlet of the variable pump and the inlet of the fixed pump are connected to the oil tank via an inlet pipeline.

[0009] The outlet of the variable pump is connected to one end of the main oil supply line via the first oil supply line, and the outlet of the fixed pump is connected to one end of the main oil supply line via the second oil supply line.

[0010] A first check valve is installed on the first oil supply line, and a second check valve is installed on the second oil supply line;

[0011] The other end of the main oil supply line is connected to a hydraulic drive device;

[0012] The accumulator is connected to the main oil supply line.

[0013] Preferably, it also includes a controller;

[0014] The output shaft of the electric motor is connected to the input shaft of the variable pump via a first electromagnetic clutch;

[0015] The output shaft of the fuel engine is connected to the input shaft of the metering pump via a second electromagnetic clutch;

[0016] The controller is connected to the control terminals of the first electromagnetic clutch and the second electromagnetic clutch via signal cables.

[0017] Preferably, it also includes a load sensor, the controller is connected to the load sensor via a signal cable, the load sensor is installed on the working platform of the aerial work vehicle, and the load sensor is used to monitor the load of the working platform in real time.

[0018] Preferably, the motor is powered by a power battery, and the controller is connected to the control terminal of the power battery via a signal cable.

[0019] Preferably, an overflow valve is provided on the main oil supply line.

[0020] Preferably, the overflow port of the overflow valve is connected to the oil tank via an overflow pipeline, and the overflow pipeline is at least partially configured as a bellows.

[0021] Preferably, a proportional flow valve is installed on the main oil supply line.

[0022] Preferably, a reversing valve is provided on the main oil supply line.

[0023] Preferably, a filter is installed on the oil inlet pipe.

[0024] Preferably, the return oil end of the hydraulic drive device is connected to the oil tank via a return oil pipeline, and a cooler is provided on the return oil pipeline.

[0025] The beneficial effects of this utility model are as follows:

[0026] This invention proposes a transmission system for aerial work platforms based on multimodal drive. The switching process between the two power sources is flexible and smooth, without causing hydraulic shock to the hydraulic transmission system. By adopting a dual-mode power source, the system's fuel consumption is reduced by about 30%, the efficiency of the pure electric mode is increased by about 40%, and the overall energy consumption under typical working conditions (such as leveling and luffing) is reduced by about 35%. In addition, the system switches between the two power sources according to the load changes of the work platform and / or the battery status, so that the power source mode matches the working conditions in real time. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the main structure of the aerial work vehicle transmission system based on multimodal drive in this embodiment of the present invention;

[0028] Figure 2 This is a partial structural schematic diagram of the transmission system of the aerial work vehicle based on multimodal drive in an embodiment of this utility model;

[0029] Figure label:

[0030] 11. Variable displacement pump; 12. Electric motor; 21. Fixed displacement pump; 22. Fuel engine; 3. Fuel tank; 4. Hydraulic drive unit; 5. Accumulator; 61. First electromagnetic clutch; 62. Second electromagnetic clutch; 71. Controller; 72. Load sensor; 73. Power battery; 81. Inlet line; 821. First supply line; 822. Second supply line; 83. Main supply line; 84. Overflow line; 841. Bellows; 85. Return line; 91. Filter; 921. First check valve; 922. Second check valve; 93. Relief valve; 94. Proportional flow valve; 95. Directional valve; 96. Cooler. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Combination Figure 1 , Figure 2 As shown, this utility model proposes a transmission system for an aerial work platform based on multimodal drive, including a variable pump 11, an electric motor 12, a fixed displacement pump 21, a fuel engine 22, an oil tank 3, a hydraulic drive device 4, and an accumulator 5.

[0034] The variable pump 11 is driven by the electric motor 12, constituting an electric drive mode; the fixed displacement pump 21 is driven by the fuel engine 22, constituting a mechanical drive mode.

[0035] The output shaft of the electric motor 12 is connected to the input shaft of the variable pump 11 via the first electromagnetic clutch 61, and the output shaft of the fuel engine 22 is connected to the input shaft of the fixed displacement pump 21 via the second electromagnetic clutch 62. The controller 71 is an on-board controller, which is connected to the control terminals of the electric motor 12, the fuel engine 22, the first electromagnetic clutch 61, and the second electromagnetic clutch 62 via signal cables.

[0036] The oil inlet of the variable pump 11 and the oil inlet of the fixed pump 21 are connected to the oil tank 3 via the oil inlet pipe 81, and a filter 91 is installed on the oil inlet pipe 81.

[0037] The oil outlet of the variable pump 11 is connected to one end of the main oil supply line 83 via the first oil supply line 821, and the oil outlet of the fixed pump 11 is connected to one end of the main oil supply line 83 via the second oil supply line 822.

[0038] A first check valve 921 is installed on the first oil supply line 821, and a second check valve 922 is installed on the second oil supply line 822.

[0039] The other end of the main oil supply line 83 is connected to a hydraulic drive device 4, which in this embodiment is a hydraulic motor. An accumulator 5 is connected to the main oil supply line 83.

[0040] The main oil supply line 83 is equipped with an overflow valve 93, a proportional flow valve 94, and a directional valve 95.

[0041] The overflow port of the overflow valve 93 is connected to the oil tank 3 via the overflow pipe 84, and the overflow pipe 84 is at least partially configured as a bellows 841.

[0042] The return end of the hydraulic drive device 4 is connected to the oil tank 3 via the return oil pipeline 85, and a cooler 96 is installed on the return oil pipeline 85.

[0043] The load sensor 72 is installed on the working platform of the aerial work vehicle. The load sensor 72 is used to monitor the load of the working platform in real time. The controller 71 is connected to the load sensor 72 via a signal cable.

[0044] The electric motor 12 is powered by the power battery 73, and the controller 71 is connected to the control terminal of the power battery 73 via a signal cable.

[0045] The operating principle of the aerial work platform transmission system based on multimodal drive in this embodiment is described as follows:

[0046] The electric motor 12 or the fuel engine 22 can be selectively started. In this embodiment, the following control logic is adopted: when the SOC of the power battery 73 is ≤30% or the load monitored by the load sensor 72 is ≥70% of the rated load, the fuel engine 22 is started; when the SOC of the power battery 73 is ≥70% and the load monitored by the load sensor 72 is ≤30% of the rated load, the electric motor 12 is started.

[0047] When the electric motor 12 is started, the controller 71 triggers the first electromagnetic clutch 61, which connects the output shaft of the electric motor 12 and the input shaft of the variable pump 11. At the same time, the controller 71 triggers the second electromagnetic clutch 62, which disconnects the output shaft of the fuel engine 22 from the input shaft of the fixed displacement pump 21.

[0048] When the fuel engine 22 is started, the controller 71 triggers the second electromagnetic clutch 62, which connects the output shaft of the fuel engine 22 to the input shaft of the fixed displacement pump 21. At the same time, the controller 71 triggers the first electromagnetic clutch 61, which disconnects the output shaft of the electric motor 12 from the input shaft of the variable displacement pump 11.

[0049] When oil enters through the oil inlet line 81, the hydraulic oil is filtered through the filter 91 on the oil inlet line 81 to protect the downstream hydraulic components.

[0050] A first check valve 921 is installed on the first oil supply line 821, allowing hydraulic oil to flow unidirectionally from the first oil supply line 821 to the main oil supply line 83; a second check valve 922 is installed on the second oil supply line 822, allowing hydraulic oil to flow unidirectionally from the second oil supply line 822 to the main oil supply line 83. This ensures that the oil supply from the first oil supply line 821 and the second oil supply line 822 does not interfere with each other.

[0051] An accumulator 5 is connected to the main oil supply line 83. The accumulator 5 is pre-pressurized. When switching between the variable pump 11 and the fixed displacement pump 21, the accumulator 5 stores and buffers the hydraulic oil in the main oil supply line 83 to stabilize the pressure and avoid hydraulic shock to the main oil supply line 83.

[0052] An overflow valve 93 is installed on the main oil supply line 83, and the maximum oil pressure of the main oil supply line 83 is set. When the oil pressure in the main oil supply line 83 exceeds the set threshold, the pressure is relieved through the overflow valve 93 to ensure the stability and safety of the oil pressure in the main oil supply line 83.

[0053] A proportional flow valve 94 is installed on the main oil supply line 83 to regulate the flow rate of hydraulic oil supplied to the hydraulic drive device 4, thereby ensuring a stable oil supply to the hydraulic drive device 4.

[0054] A directional valve 95 is installed on the main oil supply line 83, specifically a three-position four-way solenoid directional valve, which controls the oil flow direction through manual / automatic mode switching (with position encoder feedback) to achieve oil supply control for the hydraulic drive device 4.

[0055] The overflow line 84 is at least partially configured as a bellows 841 to reduce hydraulic oil flow resistance and reduce energy consumption by 15% compared to conventional lines.

[0056] A cooler 96 is installed on the return oil line 85 to cool the hydraulic oil in the return oil line 85.

[0057] The present invention has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the multi-modal drive-based aerial work platform transmission system of the present invention. The multi-modal drive-based aerial work platform transmission system described in this invention features a flexible and smooth switching process between the two power sources, without causing hydraulic shock to the hydraulic transmission system. Using a dual-modal power source reduces system fuel consumption by approximately 30%, increases pure electric mode efficiency by approximately 40%, and reduces overall energy consumption by approximately 35% under typical working conditions (such as leveling and luffing). Furthermore, the system switches between the two power sources according to changes in the load of the work platform and / or battery status, ensuring that the power source mode matches the working conditions in real time.

[0058] Of course, the above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model and should be protected by the present utility model.

Claims

1. A transmission system for an aerial work platform vehicle based on multimodal drive, characterized in that, This includes variable displacement pumps, electric motors, fixed displacement pumps, fuel engines, fuel tanks, hydraulic drive units, and accumulators; The variable pump is driven by an electric motor, and the fixed displacement pump is driven by a fuel engine; The inlet of the variable pump and the inlet of the fixed pump are connected to the oil tank via an inlet pipeline. The outlet of the variable pump is connected to one end of the main oil supply line via the first oil supply line, and the outlet of the fixed pump is connected to one end of the main oil supply line via the second oil supply line. A first check valve is installed on the first oil supply line, and a second check valve is installed on the second oil supply line; The other end of the main oil supply line is connected to a hydraulic drive device; The accumulator is connected to the main oil supply line.

2. The aerial work platform transmission system based on multimodal drive according to claim 1, characterized in that, It also includes the controller; The output shaft of the electric motor is connected to the input shaft of the variable pump via a first electromagnetic clutch; The output shaft of the fuel engine is connected to the input shaft of the metering pump via a second electromagnetic clutch; The controller is connected to the control terminals of the first electromagnetic clutch and the second electromagnetic clutch via signal cables.

3. The aerial work platform transmission system based on multimodal drive according to claim 2, characterized in that, It also includes a load sensor, which is connected to the controller via a signal cable. The load sensor is installed on the working platform of the aerial work vehicle and is used to monitor the load on the working platform in real time.

4. The aerial work platform transmission system based on multimodal drive according to claim 2, characterized in that, The electric motor is powered by a power battery, and the controller is connected to the control terminal of the power battery via a signal cable.

5. The aerial work platform transmission system based on multimodal drive according to claim 1, characterized in that, An overflow valve is installed on the main oil supply line.

6. The aerial work platform transmission system based on multimodal drive according to claim 5, characterized in that, The overflow port of the overflow valve is connected to the oil tank via an overflow pipeline, and the overflow pipeline is at least partially corrugated.

7. The aerial work platform transmission system based on multimodal drive according to claim 1, characterized in that, A proportional flow valve is installed on the main oil supply line.

8. The aerial work platform transmission system based on multimodal drive according to claim 1, characterized in that, A reversing valve is installed on the main oil supply line.

9. The aerial work platform transmission system based on multimodal drive according to claim 1, characterized in that, A filter is installed on the oil inlet pipe.

10. The aerial work platform transmission system based on multimodal drive according to claim 1, characterized in that, The return oil end of the hydraulic drive device is connected to the oil tank via a return oil pipeline, and a cooler is installed on the return oil pipeline.

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